Process for Manufacturing a Flexible Packaging Laminate for Filling Liquids in Pouches Such as Edible Oil Pouches

ABSTRACT

The present invention provides a process for manufacturing a flexible packaging laminates for filling liquids in pouches such as edible oil pouches comprising: —taking granules of polypropylene and medium density polyethylene in the proportion 1-1.5:1.5-2.5 ratio, —melting the said granules at 200/230 deg. C. in 3 layer lawn film extruder to form a co-extruded film, —printing said film by Rotogravure printing technique at 40-60 deg. C., —laminating said printed film with conventional 5 layer co-extruded nylon film at 60-80 deg. C., —curing the said laminated film at 35-45 deg. C. for at least 2 days, —slitting said laminated film to the desired size for using on Form Fill Seal machine (FFS Machine) at temperature 160-180 deg. C. for making pouches to fill liquids such as edible oil pouches.

FIELD OF THE INVENTION

This invention relates to a process for manufacturing a flexiblepackaging laminate for filling liquids in pouches such as edible oilpouches.

BACKGROUND OF THE INVENTION

The conventional film or laminate for making edible oil pouches consistsof either 3 layers co-extruded polyethylene film or 5 layers co-extrudednylon film or 2-layer laminate of polyester film and polyethylene film.These conventional films or laminates have the following dis-advantages

Dis-Advantages for Conventional Film

-   -   The film has poor print protection as printing is done on the        surface of the film    -   The film print re-production and gloss are poor. This limits the        scope to generate a premium image through the best possible        printing on the film for enhancing the brand value

Dis-Advantages of Laminates

-   -   Laminates are very stiff because of inherent property of        polyester film    -   Laminates are not flexible enough because of low elongation        values    -   Pouch making from the laminates on Form Fill Seal Machine (FFS        Machine) is also not operator friendly because of non-heat        sealable nature of polyester film.

OBJECT

The object of this invention is to overcome the dis-advantages of theconventional film as well as the conventional laminates used for makingflexible packaging laminates for filling liquids in pouches such asedible oil pouches.

To achieve this objective, this invention provides a process formanufacturing a flexible packaging laminates for filling liquids inpouches such as edible oil pouches comprising:

-   -   taking granules of polypropylene and medium density polyethylene        in the proportion 1-1.5:1.5-2.5 ratio,    -   melting the said granules at 200/230 deg. C. in 3 layer lawn        film extruder to form a co-extruded film,    -   printing said film by Rotogravure printing technique at 40-60        deg. C.,    -   laminating said printed film with conventional 5 layer        co-extruded nylon film at 60-80 deg. C.,    -   curing the said laminated film at 35-45 deg. C. for at least 2        days,    -   slitting said laminated film to the desired size for using on        Form Fill Seal machine (FFS Machine) at temperature 160-180        deg. C. for making pouches to fill liquids such as edible oil        pouches.        The invention will now be described with reference to the        following example:

EXAMPLE

Taking polypropylene granules in hopper (H1) for the middle layer ofblown film co-extruder (EM) and further taking medium densitypolyethylene granules in the other two hoppers (H2, H3) of outer andinner layer of said co-extruder (E0, E1) in the ratio 1:2. The saidco-extruders with hoppers are shown in FIG. 1 of the accompanyingdrawings.

The hoppers (H1, H2) and (H3) are connected to barrels B4, B5 and B6.Melting said granules in said barrels of said co-extruder at 230 deg. C.Co-extruded melted layers passes through the die (D7) and is blown inthe form of a balloon (F). The said balloon (F) is cut to two webs. Thesaid two webs are re-mound in two re-winders (R10, R11) for printing.One of the said roll (R10) is taken for Roto Graver Printing Technique(RGP technique) at 50 deg. C. Laminating said printed film withconventional five layer co-extruded nylon film at 70 deg. C. Thereafter,curing it at 40 deg. C. Slitting of said laminated film to desired sizefor using on conventional Form Filled Seal machine (not shown) at 170deg. C. to make filled edible oil pouch.

1. A process for manufacturing a flexible packaging laminates forfilling liquids in pouches such as edible oil pouches comprising: takinggranules of polypropylene and medium density polyethylene in theproportion 1-1.5:1.5-2.5 ratio, melting the said granules at 200/230deg. C. in 3 layer lawn film extruder to form a co-extruded film,printing said film by Rotogravure printing technique at 40-60 deg. C.,laminating said printed film with conventional 5 layer co-extruded nylonfilm at 60-80 deg. C., curing the said laminated film at 35-45 deg. C.for at least 2 days, slitting said laminated film to the desired sizefor using on Form Fill Seal machine (FFS Machine) at temperature 160-180deg. C. for making pouches to fill liquids such as edible oil pouches.2. A process for manufacturing packaging laminates for making liquidpouches such as edible oil pouches substantially as herein describedwith reference to the example.
 3. A filled liquid pouch such as anedible oil pouch made by a flexible packaging laminates wheneverprepared by the process as claimed in claim 1.